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Acquisitions Narrative (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net $ 185.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet $ 97.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet $ 201.0us-gaap_BusinessCombinationRecognizedIdentifiableAssetsAcquiredAndLiabilitiesAssumedNet
Number of Businesses Acquired 8us-gaap_NumberOfBusinessesAcquired 11us-gaap_NumberOfBusinessesAcquired 12us-gaap_NumberOfBusinessesAcquired
IAN      
Number of Businesses Acquired 6us-gaap_NumberOfBusinessesAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 9us-gaap_NumberOfBusinessesAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember		 8us-gaap_NumberOfBusinessesAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= us-gaap_OperatingSegmentsMember
CMG      
Number of Businesses Acquired 2us-gaap_NumberOfBusinessesAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= ipg_ReportableSegmentsTwoMember		 2us-gaap_NumberOfBusinessesAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= ipg_ReportableSegmentsTwoMember		 4us-gaap_NumberOfBusinessesAcquired
/ us-gaap_StatementBusinessSegmentsAxis
= ipg_ReportableSegmentsTwoMember